/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
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 *
 *
 *
 *
 *
 *
 *
 */

package javax.swing.colorchooser;

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import javax.swing.text.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.Serializable;
import sun.swing.SwingUtilities2;


/**
 * The standard preview panel for the color chooser.
 * <p>
 * <strong>Warning:</strong>
 * Serialized objects of this class will not be compatible with
 * future Swing releases. The current serialization support is
 * appropriate for short term storage or RMI between applications running
 * the same version of Swing.  As of 1.4, support for long term storage
 * of all JavaBeans&trade;
 * has been added to the <code>java.beans</code> package.
 * Please see {@link java.beans.XMLEncoder}.
 *
 * @author Steve Wilson
 * @see JColorChooser
 */
class DefaultPreviewPanel extends JPanel {

  private int squareSize = 25;
  private int squareGap = 5;
  private int innerGap = 5;


  private int textGap = 5;
  private Font font = new Font(Font.DIALOG, Font.PLAIN, 12);
  private String sampleText;

  private int swatchWidth = 50;

  private Color oldColor = null;

  private JColorChooser getColorChooser() {
    return (JColorChooser) SwingUtilities.getAncestorOfClass(
        JColorChooser.class, this);
  }

  public Dimension getPreferredSize() {
    JComponent host = getColorChooser();
    if (host == null) {
      host = this;
    }
    FontMetrics fm = host.getFontMetrics(getFont());

    int ascent = fm.getAscent();
    int height = fm.getHeight();
    int width = SwingUtilities2.stringWidth(host, fm, getSampleText());

    int y = height * 3 + textGap * 3;
    int x = squareSize * 3 + squareGap * 2 + swatchWidth + width + textGap * 3;
    return new Dimension(x, y);
  }

  public void paintComponent(Graphics g) {
    if (oldColor == null) {
      oldColor = getForeground();
    }

    g.setColor(getBackground());
    g.fillRect(0, 0, getWidth(), getHeight());

    if (this.getComponentOrientation().isLeftToRight()) {
      int squareWidth = paintSquares(g, 0);
      int textWidth = paintText(g, squareWidth);
      paintSwatch(g, squareWidth + textWidth);
    } else {
      int swatchWidth = paintSwatch(g, 0);
      int textWidth = paintText(g, swatchWidth);
      paintSquares(g, swatchWidth + textWidth);

    }
  }

  private int paintSwatch(Graphics g, int offsetX) {
    int swatchX = offsetX;
    g.setColor(oldColor);
    g.fillRect(swatchX, 0, swatchWidth, (squareSize) + (squareGap / 2));
    g.setColor(getForeground());
    g.fillRect(swatchX, (squareSize) + (squareGap / 2), swatchWidth,
        (squareSize) + (squareGap / 2));
    return (swatchX + swatchWidth);
  }

  private int paintText(Graphics g, int offsetX) {
    g.setFont(getFont());
    JComponent host = getColorChooser();
    if (host == null) {
      host = this;
    }
    FontMetrics fm = SwingUtilities2.getFontMetrics(host, g);

    int ascent = fm.getAscent();
    int height = fm.getHeight();
    int width = SwingUtilities2.stringWidth(host, fm, getSampleText());

    int textXOffset = offsetX + textGap;

    Color color = getForeground();

    g.setColor(color);

    SwingUtilities2.drawString(host, g, getSampleText(), textXOffset + (textGap / 2),
        ascent + 2);

    g.fillRect(textXOffset,
        (height) + textGap,
        width + (textGap),
        height + 2);

    g.setColor(Color.black);
    SwingUtilities2.drawString(host, g, getSampleText(),
        textXOffset + (textGap / 2),
        height + ascent + textGap + 2);

    g.setColor(Color.white);

    g.fillRect(textXOffset,
        (height + textGap) * 2,
        width + (textGap),
        height + 2);

    g.setColor(color);
    SwingUtilities2.drawString(host, g, getSampleText(),
        textXOffset + (textGap / 2),
        ((height + textGap) * 2) + ascent + 2);

    return width + textGap * 3;

  }

  private int paintSquares(Graphics g, int offsetX) {

    int squareXOffset = offsetX;
    Color color = getForeground();

    g.setColor(Color.white);
    g.fillRect(squareXOffset, 0, squareSize, squareSize);
    g.setColor(color);
    g.fillRect(squareXOffset + innerGap,
        innerGap,
        squareSize - (innerGap * 2),
        squareSize - (innerGap * 2));
    g.setColor(Color.white);
    g.fillRect(squareXOffset + innerGap * 2,
        innerGap * 2,
        squareSize - (innerGap * 4),
        squareSize - (innerGap * 4));

    g.setColor(color);
    g.fillRect(squareXOffset, squareSize + squareGap, squareSize, squareSize);

    g.translate(squareSize + squareGap, 0);
    g.setColor(Color.black);
    g.fillRect(squareXOffset, 0, squareSize, squareSize);
    g.setColor(color);
    g.fillRect(squareXOffset + innerGap,
        innerGap,
        squareSize - (innerGap * 2),
        squareSize - (innerGap * 2));
    g.setColor(Color.white);
    g.fillRect(squareXOffset + innerGap * 2,
        innerGap * 2,
        squareSize - (innerGap * 4),
        squareSize - (innerGap * 4));
    g.translate(-(squareSize + squareGap), 0);

    g.translate(squareSize + squareGap, squareSize + squareGap);
    g.setColor(Color.white);
    g.fillRect(squareXOffset, 0, squareSize, squareSize);
    g.setColor(color);
    g.fillRect(squareXOffset + innerGap,
        innerGap,
        squareSize - (innerGap * 2),
        squareSize - (innerGap * 2));
    g.translate(-(squareSize + squareGap), -(squareSize + squareGap));

    g.translate((squareSize + squareGap) * 2, 0);
    g.setColor(Color.white);
    g.fillRect(squareXOffset, 0, squareSize, squareSize);
    g.setColor(color);
    g.fillRect(squareXOffset + innerGap,
        innerGap,
        squareSize - (innerGap * 2),
        squareSize - (innerGap * 2));
    g.setColor(Color.black);
    g.fillRect(squareXOffset + innerGap * 2,
        innerGap * 2,
        squareSize - (innerGap * 4),
        squareSize - (innerGap * 4));
    g.translate(-((squareSize + squareGap) * 2), 0);

    g.translate((squareSize + squareGap) * 2, (squareSize + squareGap));
    g.setColor(Color.black);
    g.fillRect(squareXOffset, 0, squareSize, squareSize);
    g.setColor(color);
    g.fillRect(squareXOffset + innerGap,
        innerGap,
        squareSize - (innerGap * 2),
        squareSize - (innerGap * 2));
    g.translate(-((squareSize + squareGap) * 2), -(squareSize + squareGap));

    return (squareSize * 3 + squareGap * 2);

  }

  private String getSampleText() {
    if (this.sampleText == null) {
      this.sampleText = UIManager.getString("ColorChooser.sampleText", getLocale());
    }
    return this.sampleText;
  }
}
